Answer:
The man intends to cut down 3000-2100 = 900 kcal. But avoiding sweets completely, he will cut down 700 kcal. To cut down another 200 kcal, he should cut down butter by \[\frac{10}{60}\times 200=33\,g\]per day. He should not cut down consumption of food, that provides him with vitamins and other vital nutrients.
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